Cellular respiration occurs in every living thing, maybe not the whole path tho. Photosynthesis is the major process that fixes carbon. Cellular respiration is the major path that converts it into energy. G will be negative (energy is released) Not every individual step will have a negative g. G will be positive (low energy high energy) Not every individual step will have a positive g. These pathways have a number of steps with an overall goal. The energy put in to form atp is from a catabolic pathway. The energy released from atp is from a anabolic pathway. This is the energy currency of the cell. Atp is the form of energy that cells use. You use the energy from catabolic pathways to drive anabolic pathways. C h bonds have lots of energy associated with them. Neither are strongly electronegative, electrons are easily stolen. We talk about glucose as it goes through the whole respiratory pathway.